HARARE, Zimbabwe (CNN) -- Zimbabwe President Robert Mugabe described the U.S. government and Western nations as "quite stupid and foolish" Tuesday for trying to be involved in the African country's affairs.

Zimbabwe President Robert Mugabe has ignored international calls for him to step down.

Mugabe made the comments at the funeral for a former senior soldier, just days after a top U.S. diplomat said the United States no longer supports a power-sharing deal between Mugabe and his political rival, Morgan Tsvangirai, that might pave the way for economic, health and other reforms.

Jendayi Frazer, U.S. assistant secretary of state for African affairs, said Sunday that the U.S. felt a viable unity government was not possible with Mugabe in power.

At the funeral, Mugabe reacted: "The inclusive government ... does not include Mr. Bush and his administration. It does not even know him. It has no relationship with him. Watch U.S. say Mugabe needs to go »

"So let him keep his comments to himself. They are undeserved, irrelevant and quite stupid and foolish. Who are they to decide who should be included or should not in an inclusive government?"

Mugabe and Tsvangirai, who leads the opposition Movement for Democratic Change, signed the unity deal September 15, but Mugabe's ZANU-PF party and the MDC have failed to implement it because they cannot agree on who should control key ministries.

U.S. President George W. Bush and other leaders have urged Mugabe to step down amid a cholera epidemic that the United Nations says has killed more than 1,000 people since August.

Mugabe blames Western sanctions for Zimbabwe's worst economic and humanitarian crisis since independence from Great Britain 28 years ago. The nation is facing acute shortages of fuel, electricity and medical drugs. The inflation rate -- the highest in the world -- is 231 million percent.

Mugabe, referring to Bush's call for him to leave office, said: "We realize that these are [the] last kicks of a dying horse. We obviously [are] not going to pay attention to a sunset administration. Zimbabwe's fate lies in the fate of Zimbabweans. They are the ones who make and unmake the leaders of the country. Their decision alone is what we go by."

Bush leaves office January 20.

Tsvangirai announced Friday that his party will withdraw from efforts to form a unity government unless 42 kidnapped party members are released or brought to court to face formal charges by New Year's Day.